llvm-project/llvm/lib/Target/Lanai/LanaiTargetMachine.cpp

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//===-- LanaiTargetMachine.cpp - Define TargetMachine for Lanai ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Implements the info about Lanai target spec.
//
//===----------------------------------------------------------------------===//
#include "LanaiTargetMachine.h"
#include "Lanai.h"
#include "LanaiTargetObjectFile.h"
#include "LanaiTargetTransformInfo.h"
#include "TargetInfo/LanaiTargetInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
namespace llvm {
void initializeLanaiMemAluCombinerPass(PassRegistry &);
} // namespace llvm
CMake: Make most target symbols hidden by default Summary: For builds with LLVM_BUILD_LLVM_DYLIB=ON and BUILD_SHARED_LIBS=OFF this change makes all symbols in the target specific libraries hidden by default. A new macro called LLVM_EXTERNAL_VISIBILITY has been added to mark symbols in these libraries public, which is mainly needed for the definitions of the LLVMInitialize* functions. This patch reduces the number of public symbols in libLLVM.so by about 25%. This should improve load times for the dynamic library and also make abi checker tools, like abidiff require less memory when analyzing libLLVM.so One side-effect of this change is that for builds with LLVM_BUILD_LLVM_DYLIB=ON and LLVM_LINK_LLVM_DYLIB=ON some unittests that access symbols that are no longer public will need to be statically linked. Before and after public symbol counts (using gcc 8.2.1, ld.bfd 2.31.1): nm before/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 36221 nm after/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 26278 Reviewers: chandlerc, beanz, mgorny, rnk, hans Reviewed By: rnk, hans Subscribers: merge_guards_bot, luismarques, smeenai, ldionne, lenary, s.egerton, pzheng, sameer.abuasal, MaskRay, wuzish, echristo, Jim, hiraditya, michaelplatings, chapuni, jholewinski, arsenm, dschuff, jyknight, dylanmckay, sdardis, nemanjai, jvesely, javed.absar, sbc100, jgravelle-google, aheejin, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, zzheng, edward-jones, mgrang, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, kristina, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D54439
2020-01-15 11:15:07 +08:00
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiTarget() {
// Register the target.
RegisterTargetMachine<LanaiTargetMachine> registered_target(
getTheLanaiTarget());
}
static std::string computeDataLayout() {
// Data layout (keep in sync with clang/lib/Basic/Targets.cpp)
return "E" // Big endian
"-m:e" // ELF name manging
"-p:32:32" // 32-bit pointers, 32 bit aligned
"-i64:64" // 64 bit integers, 64 bit aligned
"-a:0:32" // 32 bit alignment of objects of aggregate type
"-n32" // 32 bit native integer width
"-S64"; // 64 bit natural stack alignment
}
static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
2021-01-13 13:43:50 +08:00
return RM.getValueOr(Reloc::PIC_);
}
LanaiTargetMachine::LanaiTargetMachine(const Target &T, const Triple &TT,
StringRef Cpu, StringRef FeatureString,
const TargetOptions &Options,
Optional<Reloc::Model> RM,
Optional<CodeModel::Model> CodeModel,
CodeGenOpt::Level OptLevel, bool JIT)
: LLVMTargetMachine(T, computeDataLayout(), TT, Cpu, FeatureString, Options,
getEffectiveRelocModel(RM),
getEffectiveCodeModel(CodeModel, CodeModel::Medium),
OptLevel),
Subtarget(TT, Cpu, FeatureString, *this, Options, getCodeModel(),
OptLevel),
TLOF(new LanaiTargetObjectFile()) {
initAsmInfo();
}
TargetTransformInfo
LanaiTargetMachine::getTargetTransformInfo(const Function &F) {
return TargetTransformInfo(LanaiTTIImpl(this, F));
}
namespace {
// Lanai Code Generator Pass Configuration Options.
class LanaiPassConfig : public TargetPassConfig {
public:
LanaiPassConfig(LanaiTargetMachine &TM, PassManagerBase *PassManager)
: TargetPassConfig(TM, *PassManager) {}
LanaiTargetMachine &getLanaiTargetMachine() const {
return getTM<LanaiTargetMachine>();
}
bool addInstSelector() override;
void addPreSched2() override;
void addPreEmitPass() override;
};
} // namespace
TargetPassConfig *
LanaiTargetMachine::createPassConfig(PassManagerBase &PassManager) {
return new LanaiPassConfig(*this, &PassManager);
}
// Install an instruction selector pass.
bool LanaiPassConfig::addInstSelector() {
addPass(createLanaiISelDag(getLanaiTargetMachine()));
return false;
}
// Implemented by targets that want to run passes immediately before
// machine code is emitted.
void LanaiPassConfig::addPreEmitPass() {
addPass(createLanaiDelaySlotFillerPass(getLanaiTargetMachine()));
}
// Run passes after prolog-epilog insertion and before the second instruction
// scheduling pass.
void LanaiPassConfig::addPreSched2() {
addPass(createLanaiMemAluCombinerPass());
}